/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup libc
* @{
*/
/** @file
*/
#include <libc.h>
#include <sysinfo.h>
#include <str.h>
#include <errno.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stddef.h>
/** Get sysinfo keys size
*
* @param path Sysinfo path.
* @param value Pointer to store the keys size.
*
* @return EOK if the keys were successfully read.
*
*/
static errno_t sysinfo_get_keys_size(const char *path, size_t *size)
{
return (errno_t) __SYSCALL3(SYS_SYSINFO_GET_KEYS_SIZE, (sysarg_t) path,
(sysarg_t) str_size(path), (sysarg_t) size);
}
/** Get sysinfo keys
*
* @param path Sysinfo path.
* @param value Pointer to store the keys size.
*
* @return Keys read from sysinfo or NULL if the
* sysinfo item has no subkeys.
* The returned non-NULL pointer should be
* freed by free().
*
*/
char *sysinfo_get_keys(const char *path, size_t *size)
{
/*
* The size of the keys might change during time.
* Unfortunatelly we cannot allocate the buffer
* and transfer the keys as a single atomic operation.
*/
/* Get the keys size */
errno_t ret = sysinfo_get_keys_size(path, size);
if ((ret != EOK) || (size == 0)) {
/*
* Item with no subkeys.
*/
*size = 0;
return NULL;
}
char *data = malloc(*size);
if (data == NULL) {
*size = 0;
return NULL;
}
/* Get the data */
size_t sz;
ret = (errno_t) __SYSCALL5(SYS_SYSINFO_GET_KEYS, (sysarg_t) path,
(sysarg_t) str_size(path), (sysarg_t) data, (sysarg_t) *size,
(sysarg_t) &sz);
if (ret == EOK) {
*size = sz;
return data;
}
free(data);
*size = 0;
return NULL;
}
/** Get sysinfo item type
*
* @param path Sysinfo path.
*
* @return Sysinfo item type.
*
*/
sysinfo_item_val_type_t sysinfo_get_val_type(const char *path)
{
return (sysinfo_item_val_type_t) __SYSCALL2(SYS_SYSINFO_GET_VAL_TYPE,
(sysarg_t) path, (sysarg_t) str_size(path));
}
/** Get sysinfo numerical value
*
* @param path Sysinfo path.
* @param value Pointer to store the numerical value to.
*
* @return EOK if the value was successfully read and
* is of SYSINFO_VAL_VAL type.
*
*/
errno_t sysinfo_get_value(const char *path, sysarg_t *value)
{
return (errno_t) __SYSCALL3(SYS_SYSINFO_GET_VALUE, (sysarg_t) path,
(sysarg_t) str_size(path), (sysarg_t) value);
}
/** Get sysinfo binary data size
*
* @param path Sysinfo path.
* @param size Pointer to store the binary data size.
*
* @return EOK if the value was successfully read and
* is of SYSINFO_VAL_DATA type.
*
*/
static errno_t sysinfo_get_data_size(const char *path, size_t *size)
{
return (errno_t) __SYSCALL3(SYS_SYSINFO_GET_DATA_SIZE, (sysarg_t) path,
(sysarg_t) str_size(path), (sysarg_t) size);
}
/** Get sysinfo binary data
*
* @param path Sysinfo path.
* @param size Pointer to store the binary data size.
*
* @return Binary data read from sysinfo or NULL if the
* sysinfo item value type is not binary data.
* The returned non-NULL pointer should be
* freed by free().
*
*/
void *sysinfo_get_data(const char *path, size_t *size)
{
/*
* The binary data size might change during time.
* Unfortunatelly we cannot allocate the buffer
* and transfer the data as a single atomic operation.
*/
/* Get the binary data size */
errno_t ret = sysinfo_get_data_size(path, size);
if ((ret != EOK) || (size == 0)) {
/*
* Not a binary data item
* or an empty item.
*/
*size = 0;
return NULL;
}
void *data = malloc(*size);
if (data == NULL) {
*size = 0;
return NULL;
}
/* Get the data */
size_t sz;
ret = (errno_t) __SYSCALL5(SYS_SYSINFO_GET_DATA, (sysarg_t) path,
(sysarg_t) str_size(path), (sysarg_t) data, (sysarg_t) *size,
(sysarg_t) &sz);
if (ret == EOK) {
*size = sz;
return data;
}
free(data);
*size = 0;
return NULL;
}
/** Get sysinfo property
*
* @param path Sysinfo path.
* @param name Property name.
* @param size Pointer to store the binary data size.
*
* @return Property value read from sysinfo or NULL if the
* sysinfo item value type is not binary data.
* The returned non-NULL pointer should be
* freed by free().
*
*/
void *sysinfo_get_property(const char *path, const char *name, size_t *size)
{
size_t total_size;
void *data = sysinfo_get_data(path, &total_size);
if ((data == NULL) || (total_size == 0)) {
*size = 0;
return NULL;
}
size_t pos = 0;
while (pos < total_size) {
/* Process each property with sanity checks */
size_t cur_size = str_nsize(data + pos, total_size - pos);
if (((char *) data)[pos + cur_size] != 0)
break;
bool found = (str_cmp(data + pos, name) == 0);
pos += cur_size + 1;
if (pos >= total_size)
break;
/* Process value size */
size_t value_size;
memcpy(&value_size, data + pos, sizeof(value_size));
pos += sizeof(value_size);
if ((pos >= total_size) || (pos + value_size > total_size))
break;
if (found) {
void *value = malloc(value_size);
if (value == NULL)
break;
memcpy(value, data + pos, value_size);
free(data);
*size = value_size;
return value;
}
pos += value_size;
}
free(data);
*size = 0;
return NULL;
}
/** @}
*/